Which of the following statements regarding Down syndrome is false?
A) Trisomy 21 is the cause of Down syndrome.
B) Down syndrome is the most common serious birth defect in the United States.
C) People with Down syndrome usually have a shorter life span than normal.
D) Down syndrome is least likely to be seen in the infants of mothers over 40.
Answer: D
You might also like to view...
The brain center for homeostatic control of the internal environment is the ________
a. hypothalamus b. cerebellum c. pons d. thalamus
Which type of skeleton is found in earthworms?
a. Exoskeletons b. Axial skeleton c. Endoskeletons d. Appendicular skeleton e. Hydrostatic skeleton
Which of the following engulf and digest pathogens at the beginning of the inflammatory response?
a. Interferons b. Neutrophils c. Macrophages d. Monocytes
The rate of net primary productivity can be limited directly by the availability of
A) organic nutrients in the soil solution. B) inorganic nutrients in the soil solution. C) organic carbon in the soil solution. D) inorganic carbon in the soil solution.